Restoring the chrome variatioons client, with a fix for browser_test failures caused by it.

chrome/browser/browser_process_impl.h

Index: chrome/browser/browser_process_impl.h
diff --git a/chrome/browser/browser_process_impl.h b/chrome/browser/browser_process_impl.h
index 16685e474afb57b6d9276be04f22508bde00ed19..425cecca1696636c5de04636367844ebfd7e1449 100644
--- a/chrome/browser/browser_process_impl.h
+++ b/chrome/browser/browser_process_impl.h
@@ -68,6 +68,7 @@ class BrowserProcessImpl : public BrowserProcess,
   virtual PrefService* local_state() OVERRIDE;
   virtual ui::Clipboard* clipboard() OVERRIDE;
   virtual net::URLRequestContextGetter* system_request_context() OVERRIDE;
+  virtual VariationsService* variations_service() OVERRIDE;
 #if defined(OS_CHROMEOS)
   virtual chromeos::OomPriorityManager* oom_priority_manager() OVERRIDE;
 #endif  // defined(OS_CHROMEOS)
@@ -180,6 +181,8 @@ class BrowserProcessImpl : public BrowserProcess,
 
   scoped_ptr<ui::Clipboard> clipboard_;
 
+  scoped_ptr<VariationsService> variations_service_;
+
   // Manager for desktop notification UI.
   bool created_notification_ui_manager_;
   scoped_ptr<NotificationUIManager> notification_ui_manager_;